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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ca896ddb25b926ea640d409acd781a79de82105b625d93e236a7264a85fc4e' 
  AND token = 'IcliO/hzpCe5355slcxSVoDP7S2R9rxtzBPsY3DGOvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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