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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cb47f23eb56a7181bbb5828565e66a07f3c3e261602a79f6107f53517cdc5a' 
  AND token = '9gR0LOpmJRUW9ayHAEmax69hfAcg0fIfzCixyvQG2Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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