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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6850f331edc0f88e19457b6aa51560cdb3c8c393912fdee260521cb6fa1c1537' 
  AND token = 'ZNdy7Hga1rhMXepyy5Xc4i0hGqRKOexdCJUx4X2x16E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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