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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34338ae7205c43b8b39f4c30e4b393fe6ffd5900148e5a9ac55cb355937a6ba7' 
  AND token = 'GJJI+DMMwXSFZUAXA/YFBE9sYMRqk5/Q5sR6hHIuwRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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