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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee96fe96c56b2bb578ee3d27829043c26ac19cce6667b89ad7d8eed79d86e1b' 
  AND token = 'Fxy3arHk9f+WZytzDWfpGSCF7zYtp6rELzNrR28uHj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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