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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942f9578eee3183454ac21ba6c3686abb457b520d988c2db4a73417dcc076b73' 
  AND token = 'WeIqMkqmo8bh3d6+VZTa6LixUIuvc2Rk3eq6Nz38t9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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