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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bba331777910f82ec3f86113fb716ca6ce65344b0239f9789e4af3c0ec7a1bc' 
  AND token = 'eBxZh1/iqkrGoZNTxmuJWud63/20F/lDKPJXkPI8oLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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