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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fff43ec03c5b7d620c72cda1e1e786324013bec10c72fba8b6dc6b10907aadf' 
  AND token = 'ovRG+iIzyPff0w2I8hoHSOFEeEDqEjB7V+Xbo1Mc2ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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