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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf4aa0157b344e7a3c88b218205a6edaa0da23fc5b2823f0b71844fcda17979' 
  AND token = 'A8cPPQ7w91iGO7NAbSxCtcLEk+XttgfSXltUuriEDbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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