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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e07730b32bdcfa085258ba218a069f0c958540c934a1e0fd662cee3d8ec69b5' 
  AND token = 'Sprs7oFfwt7JIQTHWx+uKt6DEx0zZYmnax/wRdBK4EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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