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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eaf73b067ea94d99173d5ec81de8e20a1dc9c1112777cf95e1d5ca4a2f435e5' 
  AND token = 'WiSXSl2YieqjTi7jOd7FbD6PKO+2ds8qXBe1QgpHkB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}