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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a18963b009d4af8d3f9c34c9cc122c113e55f16f5667c9cce694bc00edd68b' 
  AND token = 'JgypAHCzigWp8VAGn+5o7Jlf4/Sw+mYwi1L5q1Q1AdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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