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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484e257e02745c32e220a67683ff7c3dee2eb77df228d7fc1fa6ff83d349057b' 
  AND token = '/ieCls5ywhW1m61OKS7dydLT5w6EuMpbyA4LCdTX5ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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