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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58160d02af751fdeed13ea594996108e18c70833c8467b8ba5fa4d68973a2bcf' 
  AND token = 'Y8vZ1nu2Y0STrFPMAFk9Pc2lg9WR7RrtTEuVhINcFCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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