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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61e8a0e922547aec7ad33ba613171614d4ac9051d54f5c06d858ef28cd9e698' 
  AND token = 'c6yFxgxFTogg9QcVMC20y1GgKxWYFS7IJZv+un7JlVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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