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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29af17c1c20632bb58004f0ee0d620cc9c4ee64cd7282c6ca49e94be7281a947' 
  AND token = 'h0wYHAo/rVAa81Cn6dmGqKU2c5EZ/c+fAj410HL0y6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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