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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752e726cfa097b65c3c1728f51eea6bbe0471cf8bef555fb6d63e4dab6a319a7' 
  AND token = 'BuR/rT2C2rNezQOFM4T4vmPbe8LdFZ8MC6m77l8bDVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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