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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079fbc8b65d1c00215c7b3582a7ad751644d4c32e9a4a8b8e87642d4005a7b59' 
  AND token = 'ohbkNTJXRr3IoatX7x7IZonrkOJ4vXJfyQ8dYxBA52o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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