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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142fe8b9b551d0cbd27f6242170386c36aab9da7972e13c3a3344903fc236dab' 
  AND token = 'XT5Nt1IW9iii4sRLR7bXt7Ln3abgkoY+C6x47YRk38k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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