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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6aeaeeb1c2974729cbb050308f2d757d4bfe185d3d1f8cec74ed53e34a68e6' 
  AND token = '0heX8Bn6ymzEsmNj+BLlfZuzPeZMDFEwAm7N1A/Y7/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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