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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afdc9dac3ddfee9c9ba83ed848cde2bd3536f9f0577eee5d410e235776ebd52' 
  AND token = 'zSd27eLk2G3tc+qe4T0jVEyRPv3amjRcF9M8kwClr60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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