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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb186ec1dc2e0b8c7dadbfc949a4bf917d68508d000b895fa10299333929af6d' 
  AND token = 'fR3RSPaWH8PksY3/c8nfqTW0LV3DBa8Qt152ibMLBFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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