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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5cbe0ac9797e9f977213940f414549cde25fe82c02ea227e57304b64dbea7b' 
  AND token = 'e5cS+8tVSqfBa+3XCbWMDLZFX+pxMIXdLoQhq5GesL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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