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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d0ba98936397f81348247117eaf65f0f094a7016108112e4d3680f5cf3bc11' 
  AND token = 'iBv3SpPmcEc0cwkO9cyNlLHW/Imw1hsgcKoUKaIhM/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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