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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd9758c8b5abafff2514eaeb5389e539810849921612418c6edb5f90c7f5fd4' 
  AND token = 'sQbVsYbIeuO9MAsN/cgiJtJtco6sh9Zq2UqYSK5FHQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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