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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e8f97a11c71fde12b2e07b12f344a7482d5b77c91ecaa5503b5055a4cce32f' 
  AND token = 'MUToIOjDgqYCo+sx8nZNm708TumjfU2U+ixB1NLC5lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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