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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c373522d24843d240e77cfc00c793e0b0719e9f06a92eaf9dd3ae9f3f9e31a18' 
  AND token = '4d7zOYaN8QowV6Qm82+VR2sJOfUjTkK8nrMP919j/QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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