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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d02dfa07d7040954b1b8f73c0d9c34a617a4db9e971d96b960d9229b25469e' 
  AND token = 'p0cgbgaiA1bHiNVvN0t9YI8V6+/+1zxGGlnGOSlQKs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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