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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6824e28f24f6bfcbe7d18628f78675fd704151a9edca76121f645d54af22734' 
  AND token = 'c3SGpTa/Z3OXPnfjaHGAzzpEzNkt2SPA/blCVUOcYjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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