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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a203f9ff1feabaf42fce8b7f59cffae3b7483c6a1d42d9353e768747fdda43' 
  AND token = '29wAhZvok3ySG/zQE5cg07OxybizUevWbNGwv6JHHO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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