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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48829b6fa7a27b6dc5f486c48de8bdb0ad862e053414ea3b08cf6ea96a875a10' 
  AND token = 'uzipeb+B8YX61g5ViU7ahwXUwM3n2Zut6Sxbxqel2yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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