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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882f6c31b6ffc429aac531cc08b3d7689698ee0bdf515d4f3ae8cdcc6da470c8' 
  AND token = 'j7SMVTc3OacWlLQH37v4h1fgoAvqmr8oL301KZaTdsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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