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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb555e99332ae8500d1e23c04281b93af1082842b2dd6a10eb1bb2a1f6c1160' 
  AND token = 'CAPGathd1pes2sXMeVFvSFM2HvmlKeJ1gOCdUuh6A4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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