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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499b02a75136f0edf56185016ec7ed226bb2d735389e930713222dfb54dadf9b' 
  AND token = 'CMki/QU+GJJTl87xEwlbL7kSedKI2AuubwAXWzHelkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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