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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc4caad2d7eb637c32c332e2bf783e42a69094263b86c2fdccb033264eff4e1' 
  AND token = 'r9siiuAHcpBDgH45snjU7m7oUkoRo/bWOQ7blSprTZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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