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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7ef97ed069e84e23dbca5682ca1551b51c83c14b6111ee3eaabc4e5b4fb380' 
  AND token = 'jan/F9yGJgH8z3QbNUYO1FPFE+G1WXPH3alXp3gji0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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