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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d21ff4220917fa0a1e5237e8cbac0f943bb0a056cb311784a9c19005b41c1b6' 
  AND token = 'FhoH4/cgXpM3l8VEMqm8catofJSrYQ0rEzESL+u4D1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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