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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1910b446640065357658006545ca046a9f0973aaf7c67b212516268199c1503c' 
  AND token = 'Kb7UugQUJa3da+x/8nzUKrN3m07CTNpG4RNlnY87vYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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