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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdccf555171848edd2bca4b6cd6705bebbb7771f90531d153bb725a2f2e6fbbc' 
  AND token = 'e5ROCj+1fxz0Tydrq3A9+Z3Pl5voDP3ZtqYZ/i1gwWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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