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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2710f2d765ec45474da2c1ba951e5e4adc463a030e29846138bdc4a0c4bbfc39' 
  AND token = 'fwaO4YMHcws4FHnR+pFD6Cseh9Ly/HG+OFi0TCzocEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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