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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab796d81a38d4694ec484b97e2669dace96842062fca4f53c382643c5ba492b' 
  AND token = 'n6KWe9W7VHbDZrqthGqdSyVqyI11CUQt17M6wHFXboc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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