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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273fe1f706fc05e7f27127233110904bee3adb28ca37cf7985d4c5e6b9b0fd92' 
  AND token = 'OOcKItxjGJvKN87y7UBWnY90rkEqBmiQth1aZZGXKi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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