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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d88bbbbcd0620eb033f99b95f82e0809b77b99482965518d5e0ad358d9758d7' 
  AND token = 'LA6821hSQwezqL4LY6azWhVFMCFqhj02UX0/vilASAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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