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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716ca74e67ad7957ca86aa6e7e4282bbd2bb2e4468012828afa67dd0b57119c2' 
  AND token = 'EacbR+hg1i9L5f7pJVEMWULMH5DHB4e8s8KLL9SyLbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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