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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f52e4c6c1c3c0e15b8ad7f66bd4cc554880bf1a429562e2a46dcf17cd3016be' 
  AND token = 'e0Xch15+B+6ElKxivdfGvGmfqLuHUGxFSsnd7+dmTd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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