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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4d659cad1796bb4fac15d0484755c2364deb99ab93e7105bb8ac56848e8cb9' 
  AND token = 'AI4jNwlcTL04cd3fd6vxnF1/KARA9ikO3G1iLZJ8bFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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