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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d5d80f21af601b92d9127d83be556dda55e238504aabe5590ae1bdf040d802' 
  AND token = 'WuHo8v8dxlNX7MypJk/p+w5zJFo4Qf661oO1s67zPik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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