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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32870d4e77139f057f52c8fda8cb15608e8ea0d26dadbe1395772ecaf205b245' 
  AND token = 'MRszqZrcFSJHwynrMBqYtSTVYfXdex4z6A99gsXNTuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00225

JSON explain

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