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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac917a772300bbfc4f56b6a1e1f625ad1e63a3f13704a9cd19f6ca9b876c6a81' 
  AND token = 'XLr1DBaNiYxaq/BEvmIfkDloM4No9dnMbKeWOvtS5WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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