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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e0f07304b2fd8508ba86ed512155d49bcfe9c29a39497bea15ce6bbd88adf9' 
  AND token = 'CC6cLPafrFAOE094rYNQN0P59zb0B/iIngCQvo55ZSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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