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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbec65dbc80bb21c090ed8da93ddc00d4fa1ae30bf0fb55eacbdfb68c83f15f7' 
  AND token = 'qn91HfFXur0wKjwsivAAIKycCJC99r05Onz7+9z4y7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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