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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a62785eb08634884017052e508bc12722b64b1559342fa206b6978240c0cc6d' 
  AND token = 'BaLWr17qUvakHmXAqFcr8TKrHGw/1MmAw7wxTvu86zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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