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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa3d06a25b75c2e87d54e32998b358f4309a799c41f6b987bb4b8d0bc30cbef' 
  AND token = 'XMU/Gc1WH4zGTLl62lF1x1991Wx0gHf2f0vX2RwRKz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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