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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabaa4d5e7bb3d8f926fe4d025e9750b3dbf70b384fafb550ca9788a743b1819' 
  AND token = 'j0YN3UyFucJRTKtYmxb6e5Cj4IUznO3HmG4Puf4M42I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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