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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9658d21fc8786ee538d40b73af1a0969fe87336b86a4aca492464498afe083be' 
  AND token = 'PC7VtfF2oa8e/C1EFC1Kx6b/KDTu1YvgHKZ1QdmnpsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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