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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a04a5ee3d8a9597bb27ec6e2d3b49bb44b58a4083192ec621e6142652beba58' 
  AND token = 'KK/2aYBrFCvfPt1P50IXnhTzR5MuXdsxz/IpAO+z3Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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