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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb65d5e8b250ff0313879af1c1c2c6342b719fae27c14b71776fe33d14c9254' 
  AND token = 'qI3E4JFOmE22FdOARGTvcCJ2Kcb4Ld/eTaM5YbcyA60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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