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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b493d7fd3df6fac92ef2a8e80bd4d32d34e5a9beaf0d1e7597f684ce4bc55cc8' 
  AND token = 'h0jp55bASa1ILKzVXwO1uau+U3Vac1ukdzUx/Tsdux4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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