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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c1cabe30c04d7c9fbd61e7e83d72e915943f0c676b9ab0abf737e58982e7b1' 
  AND token = 'PDUztu6sKWmsQfEhexiY8MNSQCKUVUqSAj1la1scr5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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